Correction method for the correction of characteristic curves for analogized hydraulic valves in motor vehicle braking systems

A correction method comprising the steps of:

• generating, by a processor, at least one of actuation characteristic curves and correction values;
• using, by the processor, the at least one of actuation characteristic curves and correction values during a pressure control process to dimension an actuation current for one or more electrically actuated hydraulic valves which are operated in analogue fashion,
• predefining, by the processor, one actuation characteristic curve during operation of an anti-lock brake system;
• correcting, by the processor, the predefined actuation characteristic curve in the course of a learning process;
• computing, by the processor, a difference pressure between a current pressure model value for the controlled wheel and a model locking-pressure level during a wheel pressure control process,
• wherein at least one of the difference pressure and the model locking-pressure level are compared to a respective threshold, and if the at least one of the difference pressure and the model locking-pressure level exceed the respective threshold, the predefined actuation characteristic curve is not corrected;
• and
• determining, by the processor, a pressure medium volume flow Q(P) during a control cycle with the pressure model value and the model locking pressure level using a pressure medium/volume characteristic curve V(P).

A brake pressure control device having at least anti-lock brake system, wherein during a control process a controller adjusts brake pressures in a plurality of wheel brake actuators by opening and closing inlet valves, outlet valves, or both inlet valves and outlet valves,

• wherein the inlet valves can be driven in an analogue fashion by an electric current controller,
• wherein the controller carries out a correction method during an anti-lock brake control process, wherein during the correction method the controller is configured to:
• (i) generate at least one of actuation characteristic curves and correction values, (ii) use the at least one of actuation characteristic curves and correction values during a pressure control process to dimension an actuation current for one or more electrically actuated hydraulic valves which are operated in analogue fashion,
• (iii) predefine one actuation characteristic curve during operation of an anti-lock brake system,
• (iv) correct the predefined actuation characteristic curve in the course of a learning process, and
• (v) compute a difference pressure between a current pressure model value for the controlled wheel with a model locking-pressure level during a wheel pressure control process,
• wherein at least one of the difference pressure and the model locking-pressure level are compared to a respective threshold, and if the at least one of the difference pressure and the model locking-pressure level exceed the respective threshold, the predefined actuation characteristic curve is not corrected.